Circular handsaw.



No. 682,868. Patented Sept. I7, |90I.' D. A. DUGAN.

CIRCULAR HANDSAW.

(Application med Feb. e, 1901.)

(No Model.)

UNTTEDl STATES PATENT OFFICE.

DANIEL ANDREW DUGAN, OE BROOKLYN, 'NEW YORK.

CIRCULAR HAN DSAW.

SFEGIFICATION forming part of Letters Patent N 0. 682,868, datedSeptember 17, 1901.

A Application filed February 8| 1901. Serial No. 46,575. (No model.)

To all whom t may concer-n.-

Be it known that I, DANIEL ANDREW DU- GAN, a citizen of the UnitedStates, and a resident of 330 Sixth avenue, Brooklyn, in the county ofKings and State of New York, have invented certain new and usefulImprovements in Circular Handsaws, of which the following isaspecification.

The object of this invention is to provide a hand sawing-machine whichwill be especially adapted for cutting flooring, veneering, and likematerial.

It consists, essentially, of a base of suitable length and Width havingon its upper side a longitudinal groove, within which is a bar the endsof which rest ou springs, and it is vertically adjustable. On the upperside of this verticallymovable bar is a dovetail or T groove runningfrom end to end to receive the tongue of a base-piece which supports thesaw and mechanism for operating the same. The base is adapted tomovealong the slotted bar, carrying the circular saw therewith, thesaw beingoperated by a crank, on the shaft of which is a dilerential gearing, andthe upright and base are further provided with a handle which maybemoved back and forth. The main base-plate is preferably cast and has atone end an adjustable chest-rest, so arranged that it may be inclined atany suitable angle and.- also adjusted as to height, all of which willnow be set forth in detail.

In the drawings, Figure 1 is a side View of my improved handsawing-machine. Fig. 2 is a top or plan View of the same. Fig. 3 is anend View with the base in cross-section along line 5 of Fig. 2, and Fig.4 is an en' larged Vertical longitudinal section of the differentialgearing and crank operating mechanism.

In constructing my invention I provide a main base 6, preferably ofcast-iron, the lower side of which is centrally cut away, as at '7, sothat the bearing or rest is at the ends of the base, thus providingclearance, so that the material to be cut can rest below the basepieceand still be within operative reach of the saw. At one end of the baseis a tubular stem 8,hinged thereto'and adapted to be firmly held at anyangle by a set-screw 9, which passes into the base from one side. Withinthis tubular stem is the shank 10 of a rest 11,

the shank being held in place by a clampingband l2 and screw 13 of theusual form of construction. The object of this is to provide achest-rest for the user in operating the saw. On top of this main baseis a bar 14, on the upper side of which is a T-groove 15, which extendsfrom end to end. This bar rests in a groove or slotted opening 16 in thebase 6 and at each end is a socket 17 on the under side to receive acoiled spring 18, and a series of holes 17 in the end of the bar 14enables meto employ a pin 1S to hold the bar 14 when adjusted to anypoint.

The standard or upright 19 has a base 20, provided with a tongueT-shaped in crosssection and adapted to fit within the groove l5, sothat the base 20 will slide freely therein. The upper end of thestandard is bent forwardly into a step-like formation having ahorizontally-projecting arm 22 to receive the crank-shaft 23. The stepformation is composed ,of twobranches 24 of the upright,

.slightly separated from each other, so that when the pinion 25 isplaced on the inner end of the shaft 23 it will rest between these twobranches and operatively engage the large intervening pinion 26 belowit, the latter being mounted on a pin 27, projecting from the front faceof the standard. This latter pinion 26 engages with a smaller pinion 28,which is mounted on the horizontal shaft 29,that passes through thestandard and carries on its rear end the circular saw 30.

The crank-shaft 23 has on its outer end a differential gearing composedof the bevelgear 31, which is rigidly secured tothe shaft, thebevel-toothed head 32, integral with the housing 22, and theinterveningbevelgear 33. The crank-head 34 of the crank 35 is placedloosely on the shaft, and the bevel-gear 33 is loosely mounted on thestem 36, which projects out from the head 34. It is obvious, therefore,that the speed of the crank-shaft will be accelerated without usinglarge gearwheels, although it is obvious that multiplying gear-wheelsmay be used, if desired.

A handle 37 is cast with the standard 19 and base 20 and so located thatthe operator can readily grasp it, and thus steady the mechanism, aswell as move the standard back and forth as may be required during thesawing operationA IOO It is obvious that the apparatus in the formherein shown may be so placed in position that it will accurately outthe material or adjusted to meet the requirements. It is easily operatedand all the parts are accessible.

What I claim as new isl. A hand sawing-machine composed of a base havingthereon a vertically-adjustable guide-plate provided with a groovetherein, in combination with a standard, having a baseplate with atongue fitting within the groove of the guide-plate, said standardhaving a handle for controlling same, a circular saw and crank foroperating the same and intervening gearing between the crank and the sawshafts, substantially as set forth.

2. A hand sawing-machine composed of a base having avertically-adjustable guide-` plate thereon, Aa standard adapted to movealong on said guide plate, a circular saw mounted on a horizontal shaftin said standard, a crank-shaft having a differential gearing thereon,and intermediate gearing between the crank-shaft and saw-shaft,substantially as set forth.

3. A hand sawing-machine composed of a base in combination with avertically-adj ustable guide-plate, a standard adapted to move on saidguide-plate, said standard having at its upper end a forwardly-extendingstep-like projection composed of two sli ghtlyseparated branches, unitedto form a horizontally-projecting housing, a crank-shaft in said housinghaving at its rear end a pinion between the branches of the step-likeprojection and below said projection a pair of gears on the front sideof the standard and a circular saw mounted on a shaft in the standardand operated by said gear-wheels, substantially as set forth.

4. A hand sawing-machine composed of a base, in combination with agrooved guideplate thereon and a standard adapted to move on saidguide-plate, a circular saw mounted on a shaft in said standard, acrank-shaft and a train of gearing from said shaft to the sawshaft, anda differential gearing on the crankshaft, one member of said gearingbeing integral with the standard, substantially as herein set forth.

5. A hand sawing-machine having in combination a base provided at oneend with an adjustable breast-rest, a vertically movable and adjustablegrooved guide-plate on said base, a standard on said guideplate andmovable thereon, a circular' saw mounted on a shaft in said standard, acrank-shaft having a differential gearing and intermediate gearingbetween the crank-shaft and saw-shaft and a handle on said standard forcontrolling the same, as set forth.

6. A hand sawingmachine having, in combination, a base provided at oneend with an .adjustable breastplate-rest, a longitudinal groove orslotted opening in the base, a bar in said groove, a spring at each endwithin said groove to receive the ends of the bar, a series of holes ateach end of the bar and pins to hold said bar, a `vertically-movableguideplate movable thereon and having a standard, a circula-1' sawmounted on a shaft in said standard, and a crank shaft and suitablegearing between said shaft and a saw-shaft, as set forth.

Signed at New York, in the county of New York and State of New York,this 18th day of September, A. D. 1900.

A. J. ZERBE, A. M. QUINN.

